Answer : The mass of benzamide is, 0.166 grams
Explanation :
Formula used for Elevation in boiling point :

or,

where,
= boiling point of solution =

= boiling point of liquid X =

= boiling point constant of liquid X =

m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= mass of solute (benzamide ) = ?
= mass of solvent (liquid X) = 150 g
= molar mass of solute (benzamide ) = 121.14 g/mol
Now put all the given values in the above formula, we get:


Therefore, the mass of benzamide is, 0.166 grams